ROSAT soft X-ray observations of the Be/X-ray binary X Persei.
Abstract
The Be/X-ray binary X Persei (4U 0352+30) was observed with the ROSAT Position Sensitive Proportional Counter (PSPC) in August 1992 for a total exposure time of approximately 10700 s. The 0.1-2.4 keV energy spectrum can be well fitted by a powerlaw with photon index 0.64, consistent with the powerlaw plus high-energy cutoff model found to represent the Broad Band X-ray Telescope (BBXRT) spectrum from December 1990. The amount of photo-electric absorption decreased by 30% between the two observations whereas the flux corrected for absorption remained constant. A timing analysis shows, that the spin-down episode with dot-P/P approximately 1.6 x 10-4/y since 1978 is continuing and a pulse period of 836.9s was derived.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 1994
- Bibcode:
- 1994A&A...283..175H
- Keywords:
-
- B Stars;
- Neutron Stars;
- Stellar Envelopes;
- X Ray Astronomy;
- X Ray Binaries;
- Accretion Disks;
- Emission Spectra;
- Energy Spectra;
- Rosat Mission;
- Astronomy